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Are you talking about the Alfred H Smith Bridge? That's the one with the two through truss spans supported by very tall piers. This a picture I found:
What scale are you in? There are several different kits in HO and N scale which would be very close. You do realize that the right span in the picture is 400 feet long and the left is 600 feet long, right? We're talking a big bridge here.
Josh is right, the Atlas through truss bridge has the right general shape with the curved top chord. It's 18" long. You'd need a 55" span to duplicate just the 400 foot section. If you cut that in half, you'd still have to use two bridge kits for the 400 foot span and three for 600 foot span. You'd have to kitbash them together to main the correct top chord curve, Depending on how detailed you want to get, the vertical members of the trusses are all wrong on the Atlas kit compared to the Smith bridge, You'd need to scratchbuild new side trusses to match the Smith bridge. I could be done but it would be a major project.
Remember the company that made the wood bridge kits? Well, I think it was called,"Miami of Ohio bridge kits. Not sure. They had one that you could build any length.
I made a 2 track that would hold up a dirt bike across a span. It was only about 2 ft. long. The company was bought out about 5 years ago, but, I'm sure if you search for it on line you will find the company that makes them now. They also made a kit of a trestle that was 8 ft. long. Right after Bob started this forum back in 2001 I sent someone the plans for that bridge.
PS-These "aren't" easy to put together kits. Took me 3 months to build my wood bridge.
Larry
